Generation of polyurethane foam

Details Generation of polyurethane foam Generation of polyurethane foam

1978-01-30

1979-03-13

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 465, 264 51, B29D 2704

Patent

active

041442954

ABSTRACT:
An improvement in the generation of foam from a mixture of foam-forming material in a structure having a preferred configuration. Conveying means are used to convey the structure along a horizontal path. A plurality of foam gun heads are mounted in spaced relationship to each other over and transverse to said horizontal path. Each foam gun head includes a foam dispensing outlet and valve means for controlling the discharges of the foam-forming materials therefrom. First, sensing means are provided upstream of the foam dispensing outlets for sensing the passage of the structure thereby. A plurality of second sensing means are positioned upstream of the foam dispensing outlets in spaced relationship to each other in a direction transverse to the horizontal path, each one of the second sensing means being associated with one foam gun head for sensing the presence of the structure in a vertical direction. The valve means in a foam gun head is opened in response to the first sensing means sensing the structure and its associated second sensing means also sensing the structure. The valve means of a given foam gun head is closed in response to its associated second sensing means detecting the absence of structure.

REFERENCES:
patent: 3081487 (1963-03-01), Heffner et al.
patent: 3247295 (1966-04-01), Burwell
patent: 3409044 (1968-11-01), Sobek et al.
patent: 3541023 (1970-11-01), Cole
patent: 3624885 (1971-12-01), Holliday et al.
patent: 3674399 (1972-07-01), Sendor
patent: 3677681 (1972-07-01), Zippel et al.
patent: 3833693 (1974-09-01), Ross
patent: 4051209 (1977-09-01), Tabler
patent: 4075301 (1978-02-01), Oswald

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